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Witter K, Kutsch M, Zahn R, Albert T, Dick A, Kauke T. Sequence-based typing confirmed a new HLA-A allele, A*31:53, in a liver recipient patient. ACTA ACUST UNITED AC 2011; 79:206-7. [DOI: 10.1111/j.1399-0039.2011.01819.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Crystal E, Shwiri TZ, Yang Y, Lashevsky I, Lau C, Paul G, Dick A, Kiss A, Singh S, Wright G. 686 Cardiac MRI predicts inducible ventricular tachycardia and appropriate defibrillator therapies in ischemic cardiomyopathy. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Le May M, So D, Glover C, Maloney J, Froeschl M, Marquis J, O'Brien E, Dick A, Blondeau M, Poirier P, Wells G, Chen L, Trickett J, Dionne R, Labinaz M. 392 Mortality benefit associated with direct transfer from the field for primary PCI in ST-elevation myocardial infarction. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022] Open
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79
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So D, Goncalves S, Roberts J, Stewart A, Al-turbak H, Le May M, Glover C, Marquis J, Dick A, O'Brien E, Froeschl M, Tran L, Szymanska I, Labinaz M. 332 Genetic testing for cyp2c19*2 but not for pon-1 qq carrier status predicts high on-clopidogrel platelet reactivity in patients undergoing percutaneous coronary interventions. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.619] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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80
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Gebhardt T, Music D, Ekholm M, Abrikosov IA, Vitos L, Dick A, Hickel T, Neugebauer J, Schneider JM. The influence of additions of Al and Si on the lattice stability of fcc and hcp Fe-Mn random alloys. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:246003. [PMID: 21613729 DOI: 10.1088/0953-8984/23/24/246003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We have studied the influence of additions of Al and Si on the lattice stability of face-centred-cubic (fcc) versus hexagonal-closed-packed (hcp) Fe-Mn random alloys, considering the influence of magnetism below and above the fcc Néel temperature. Employing two different ab initio approaches with respect to basis sets and treatment of magnetic and chemical disorder, we are able to quantify the predictive power of the ab initio methods. We find that the addition of Al strongly stabilizes the fcc lattice independent of the regarded magnetic states. For Si a much stronger dependence on magnetism is observed. Compared to Al, almost no volume change is observed as Si is added to Fe-Mn, indicating that the electronic contributions are responsible for stabilization/destabilization of the fcc phase.
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Witter K, Keller E, Kutsch M, Albert T, Dick A. HLA-DQB1*06:41 shown by sequence-based typing may be associated with DRB1*13:02. ACTA ACUST UNITED AC 2011; 78:223-5. [PMID: 21545409 DOI: 10.1111/j.1399-0039.2011.01686.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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82
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Rayhill S, Schwartz J, Ham J, Carithers R, Lei Y, Bhattacharya R, Liou I, Landis C, Lamaye A, Rakita R, Dick A, Healey P, Halldorson J, Bhakthavatsalam R, Perkins J, Reyes J. The use of hepatitis B core antibody-positive donor livers does not appear to have a deleterious effect on graft survival in liver transplantation for hepatitis C. Transplant Proc 2011; 42:4141-4. [PMID: 21168646 DOI: 10.1016/j.transproceed.2010.09.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2010] [Accepted: 09/09/2010] [Indexed: 11/27/2022]
Abstract
INTRODUCTION The use of hepatitis B core antibody-positive donor livers (HBcAb(+)) has steadily increased. According to a recent multivariate analysis of United Network for Organ Sharing (UNOS) data, there was no significant increase in the risk of using these donors. The increased risk among the hepatitis C virus (HCV)-positive subgroup noted in a univariate model disappeared upon multivariate analysis. However, deeper scrutiny may show that HCV-positive recipients may be at increased risk with HBcAb(+) donor livers, as they require simultaneous treatment with two antiviral regimens there may be deleterious interactions between the two viruses. Thus, the issue of HBcAb(+) donors for HCV-positive recipients merits more detailed analysis. METHODS Using UNOS registry data of all liver transplantations performed during the Model for End-Stage Liver Disease era from February 2002 through November 2007, we analyzed graft survival using Kaplan-Meier and Cox regression analyses. RESULTS Of the 12,543 HCV-positive recipients, 2,543 received HBcAb(-) livers and 853 received HBcAb(+) livers. While Kaplan-Meier analysis showed significantly lower graft survival among HCV-negative recipients of HBcAb(+) livers (P = .0001), there was no significant effect on graft survival among the HCV-positive population (P = .2). To detect an early effect in HCV-positive recipients, we examined 1-year graft survival, observing no significant difference (P = .3). To exclude a possible late effect, we examined graft survival in the HCV-positive population conditional upon surviving at least 1 year after transplantation; no significant difference was observed (P = .6). The elimination of potentially confounding codiagnoses, such as hepatitis B virus, alcoholism, acute graft failure, and hepatocellular cancer did not alter the findings. On univariate analysis, the lack of a significant effect persisted among the HCV population. However, the significant effect observed in the univariate model for the HCV-negative population became insignificant when combined with other risk factors in the multivariate model. CONCLUSION The use of HBcAb(+) livers in recipients with HCV did not appear to have a significant impact on graft survival.
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84
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Dick A. Flocculation Reaction as Test of Liver Function. BRITISH MEDICAL JOURNAL 2011; 1:182-5. [PMID: 20785896 DOI: 10.1136/bmj.1.4388.182] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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85
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Witter K, Kutsch M, Zahn R, Volgger A, Dick A. Sequence-based typing confirmed a new HLA-A allele, A*68:71. ACTA ACUST UNITED AC 2011; 78:69-70. [PMID: 21438859 DOI: 10.1111/j.1399-0039.2011.01657.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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86
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Spannagl M, Dick A, Junker R. [POCT in coagulation. Quality assurance]. Hamostaseologie 2010; 30:82-90. [PMID: 20454752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023] Open
Abstract
In the last years several point of care testing (POCT) systems used for coagulation parameters have been developed and became daily routine. As for other POCT applications (e. g. blood gas analysis) there is a need for user education and continuous improvement of quality assurance. For some POCT coagulation systems a comprehensive quality management has not been established yet. According to the feasibility and availability of control material and system self control each POCT coagulation method described in this article has a varying concept of quality management. Besides a high quality standard in manufacturing systems, devices and reagents the education of the user and the automatic self control of the instrument as well as the application of electronic and/ or liquid control samples contribute to the total quality assurance. Even if a "like versus like" control material is not available a comprehensive quality management should be implemented in daily routine concerning pre-analytic as well as technical and post-analytic criteria. Anyway to do nothing as the available control material seems to be not suitable is a bad decision.
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Dick A, Schwaiger M, Jámbor C. [Thromboelastography/-metry and external quality control. Results of a pilot study]. Hamostaseologie 2010; 30:91-95. [PMID: 20454754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023] Open
Abstract
Thromboelastography/thromboelastometry (TEG/ROTEM) is widely used in near-patient setting, especially in perioperative and intensive care medicine for the management of acute bleeding. Until now a comprehensive quality management especially an external quality control of TEG/ROTEM results is not established. Here we report about our results of a pilot survey performed in 2008 and 2009 integrated in the External Quality Assessment Schemes (EQAS) performed by INSTAND. According to this first EQAS data ROTEM results can be controlled in external quality schemes using lyophilized plasma samples. The clot firmness (A20) and clot formation kinetics characterized by the alpha-angle showed very good reproducibility both between the participants and between different surveys. Variations for CT and CFT were considerably higher especially in the plasma sample with reduced fibrinogen level. Regular participation in an external quality assurance will help to confirm this beneficial technology in emergency settings.
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Dick A, Spannagl M. [General practitioner's considerations if INR doesn't change]. MMW Fortschr Med 2009; 151:32-33. [PMID: 19739544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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Bruno R, Dick A, El-Sahwi K, Birdsall M, McLellan R. Trial of an Advanced Bipolar Electrosurgical Vessel Sealer Versus Traditional Ligation Techniques in Vaginal Hysterectomy. J Minim Invasive Gynecol 2008. [DOI: 10.1016/j.jmig.2008.09.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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90
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Bruno R, Soto-Wright V, El-Sahwi K, Dick A, Birdsall M, McLellan R. Evaluation of an Advanced Bipolar Electrosurgical Vessel Sealer Versus Conventional Ligation Technique in Abdominal Hysterectomy. J Minim Invasive Gynecol 2008. [DOI: 10.1016/j.jmig.2008.09.236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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91
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Nikulka C, Scheibel M, Dick A, Gerber Popp A, Schröder RJ. Schnittbildbefunde bei offener Rekonstruktion chronischer Glenoidranddefekte bei ventraler Schulterinstabilität mit autologer trikortikaler Beckenkammplastik. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1073866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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92
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Serban M, Dick A, Kutsch M, Giebl A, Schramm W, Kauke T, Spannagl M, Witter K. Korrelation von Geno- und Phänotyp bei einem Patienten mit von-Willebrand-Jürgens-Syndrom Typ III. Hamostaseologie 2008. [DOI: 10.1055/s-0037-1621629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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93
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Beanlands RSB, Chow BJW, Dick A, Friedrich MG, Gulenchyn KY, Kiess M, Leong-Poi H, Miller RM, Nichol G, Freeman M, Bogaty P, Honos G, Hudon G, Wisenberg G, Van Berkom J, Williams K, Yoshinaga K, Graham J. CCS/CAR/CANM/CNCS/CanSCMR joint position statement on advanced noninvasive cardiac imaging using positron emission tomography, magnetic resonance imaging and multidetector computed tomographic angiography in the diagnosis and evaluation of ischemic heart disease--executive summary. Can J Cardiol 2007; 23:107-19. [PMID: 17311116 PMCID: PMC2650646 DOI: 10.1016/s0828-282x(07)70730-4] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Over the past few decades, advanced imaging modalities with excellent diagnostic capabilities have emerged. The aim of the present position statement was to systematically review existing literature to define Canadian recommendations for their clinical use. METHODS A systematic literature review to 2005 was conducted for positron emission tomography (PET), multidetector computed tomographic angiography and magnetic resonance imaging (MRI) in ischemic heart disease. Papers that met the criteria were reviewed for accuracy, prognosis data and study quality. Recommendations were presented to primary and secondary panels of experts, and consensus was achieved. RESULTS Indications for PET include detection of coronary artery disease (CAD) with perfusion imaging, and defining viability using fluorodeoxyglucose to determine left ventricular function recovery and/or prognosis after revascularization (class I). Detection of CAD in patients, vessel segments and grafts using computed tomographic angiography was considered class IIa at the time of the literature review. Dobutamine MRI is class I for CAD detection and, along with late gadolinium enhancement MRI, class I for viability detection to predict left ventricular function recovery. Imaging must be performed at institutions and interpreted by physicians with adequate experience and training. CONCLUSIONS Cardiac imaging using advanced modalities (PET, multidetector computed tomographic angiography and MRI) is useful for CAD detection, viability definition and, in some cases, prognosis. These modalities complement the more widespread single photon emission computed tomography and echocardiography. Given the rapid evolution of technology, initial guidelines for clinical use will require regular updates. Evaluation of their integration in clinical practice should be ongoing; optimal use will require proper training. A joint effort among specialties is recommended to achieve these goals.
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Dick A. Basic and Clinical Science Course: complete set. Br J Ophthalmol 2007. [DOI: 10.1136/bjo.2005.079632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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95
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Nikulka C, Scheibel M, Dick A, Gerber-Popp A, Haas NP, Schröder RJ. Kernspintomographische Untersuchung des M.subscapularis (SSC) nach arthroskopischer und offener Schultergelenkstabilisierung. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-977032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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96
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Metzelder ML, Jesch N, Dick A, Kuebler J, Petersen C, Ure BM. Impact of prior surgery on the feasibility of laparoscopic surgery for children: a prospective study. Surg Endosc 2006; 20:1733-7. [PMID: 17024536 DOI: 10.1007/s00464-005-0772-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2005] [Accepted: 04/05/2006] [Indexed: 10/24/2022]
Abstract
BACKGROUND This study aimed to determine the impact of prior surgery on the feasibility of laparoscopic surgery for children. METHODS A prospective study analyzed 471 consecutive children who underwent laparoscopic surgery over a 4-year period. Laparoscopic procedures were classified "easy," "difficult," or "demanding." The end points of the study were conversion rate, intraoperative events, and duration of operation. RESULTS A total of 89 patients (19%) had undergone previous abdominal surgery. The conversion rate was 18% for the patients with prior surgery versus 9% for those without a prior operation (16/89 vs 35/382; p < 0.05). This difference reflects a significantly higher conversion rate for "easy" procedures among patients with than among those without prior surgery, but not for "difficult" and "demanding" procedures. The type of prior surgery had no significant impact on the mean duration of the operation. Of 71 procedures, 12 (17%) after prior conventional surgery were converted, as compared with 4 (22%) of 18 after prior laparoscopy (p > 0.05). Intraoperative events, mainly attributable to adhesions and lack of overview, occurred in 8% of patients with prior procedures, as compared with 2% without former surgery (7/89 vs 9/382; p < 0.05). Relevant complications were not significantly more frequent after prior surgery. The incidence of conversions decreased with increased time between current and previous surgery. It was 64% for surgeries less than 1 year later, 25% for surgeries 1 to 5 years later, and 5% for surgeries more than 5 years later (7/11 vs 6/24 vs 3/54; p < 0.001). CONCLUSIONS Prior surgery has a limited impact on the feasibility of laparoscopic surgery for children. The conversion rate and the incidence of intraoperative events, mainly because of adhesions and lack of overviewing, is increased, but not the incidence of relevant complications. The feasibility improves considerably with increased time between surgery and prior surgery. The authors consider laparoscopy to be the first-choice technique after prior surgery.
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Dick A, Davies CE. Measurement of the Glomerular Filtration Rate and the Effective Renal Plasma Flow Using Sodium Thiosulphate and p-Amino-Hippuric Acid. J Clin Pathol 2006; 2:67-72. [PMID: 16810832 PMCID: PMC1023216 DOI: 10.1136/jcp.2.1.67] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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98
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del Fresno M, Macchi A, Marti Z, Dick A, Clausse A. Application of color image segmentation to estrusc detection. J Vis (Tokyo) 2006. [DOI: 10.1007/bf03181760] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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99
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Pascual JI, Dick A, Hansmann M, Rust HP, Neugebauer J, Horn K. Bulk electronic structure of metals resolved with scanning tunneling microscopy. PHYSICAL REVIEW LETTERS 2006; 96:046801. [PMID: 16486866 DOI: 10.1103/physrevlett.96.046801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2005] [Indexed: 05/06/2023]
Abstract
We demonstrate that bulk band structure can have a strong influence in scanning tunneling microscopy measurements by resolving electronic interference patterns associated with scattering phenomena of bulk states at a metal surface and reconstructing the bulk band topology. Our data reveal that bulk information can be detected because states at the edge of the surface-projected bulk band have a predominant role on the scattering patterns. With the aid of density functional calculations, we associate this effect with an intrinsic increase in the projected density of states of edge states. This enhancement is characteristic of the three-dimensional bulk band curvature, a phenomenon analog to a van Hove singularity.
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Pagano CR, Dawson L, Dick A, Lerner SM, Valenia T, Braun J, Smith MA, Farrell C, Alfrey EJ. No Increase in Rejection or Graft Loss in Kidney Transplant Recipients With Thrombophilia Treated With Anticoagulation and Triple Immunosuppression. Transplant Proc 2005; 37:1902-4. [PMID: 15919499 DOI: 10.1016/j.transproceed.2005.03.082] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
INTRODUCTION Recent studies from Europe have demonstrated that patients with end-stage renal disease who receive a kidney transplant are at an increased risk for rejection and graft loss when compared with patients who have no known thrombophilia. The role of anticoagulation has not been investigated in these patients. MATERIALS AND METHODS We prospectively tested patients who were evaluated for a kidney transplant for 8 thrombophilias, protein S and C deficiencies, factor V Leiden mutation, antithrombin III deficiency, anticardiolipin antibody, lupus anticoagulant, prothrombin gene mutation, and heparin-induced platelet antibody (HIPA). Patients with any identified thrombophilia received heparin or argatroban (for HIPA (+) patients) followed by coumadin for 1 year after transplantation. Triple therapy included cyclosporine, prednisone, and CellCept (Roche Pharmaceuticals, Nutley, NJ, USA). Sensitized, black, or repeat transplantation patients received induction with an interleukin (IL)-2 inhibitor. Data were collected in a retrospective manner. Rejection was biopsy-proven. RESULTS Of the 112 transplant recipients who were tested for thrombophilia, 37 had 1 or more thrombophilia and 75 had no thrombophilia identified. Twenty-six patients received heparin and 11 received argatroban. There were no differences in recipient age, cold storage time, graft loss, HLA match, rejection episodes, 1-year graft survival, or serum creatinine level at 1 year. Significant differences were noted in posttransplantation bleeding, 35% versus 5%, and delayed graft function, 32% versus 15%, in patients with thrombophilia versus no thrombophilia, respectively. CONCLUSION This is the first study to demonstrate that there is no increase in rejection or graft loss in kidney transplant recipients with thrombophilia when treated with anticoagulation and triple immunosuppression.
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